Writing instrument



FIG. 1 is a front elevational view of a writing instrument showing our new design in an exploded condition;

FIG. 2 is a left side elevational view with the cap member in place, the right side being a mirror image thereof;

FIG. 3 is a rear elevational view of FIG. 2;

FIG. 4 is a top plan view of FIG. 2;

FIG. 5 is a bottom plan view of FIG. 2.

Disclaimed subject matter is represented in FIGS. 1, 2, 3 and 5 surrounded by dashed lines.

The base of the pen barrel depicted by means of broken lines in FIGS. 1, 2, 3, and 5 has been shown for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a writing instrument, as shown and described. 